Quotes in Tex (Tex Quote, UVa 272)

(UVA on behalf of the University of Virginia, 272 is the No. 272 question on its OJ)
In Tex, the left quotation mark is "" "and the closing quotation mark is" ". Enter an article with double quotes, and your task is to convert it into Tex format.
Sample input;
"To being or not to being," quoth the Bard, "That's the question".
Sample output:
"To being or not to being," quoth the Bard, "That's the question".
Analysis:
To distinguish between the difference, you can use a flag flag, there are spaces so it is scanf ("%s") cannot be used.

#include <stdio.h>int main(){    int c, flag;    while((c = getchar()) != EOF){        if‘"‘){            printf("%s""“""”");            flag = !flag;        }        else             printf("%c", c);    }    return0;}

Quotes in Tex (Tex Quote, UVa 272)